CN110205578B - Self-lubricating cutter for plasma spraying gradient hard coating and preparation method thereof - Google Patents
Self-lubricating cutter for plasma spraying gradient hard coating and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/16—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on nitrides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
Abstract
The invention discloses a plasma spraying gradient hard coating self-lubricating cutter and a preparation method thereof. The tool base material is high-speed steel, the surface of the base body is sequentially provided with a gradient coating consisting of a hard alloy layer, a silicon nitride ceramic layer and a cubic boron nitride layer, and the gradient coating has a self-lubricating effect. The gradient coating is prepared by adopting a plasma spraying method. The tool integrates the advantages of high-speed steel, hard alloy, silicon nitride ceramic, cubic boron nitride and gradient coatings, and the addition of Carbon Nanotubes (CNTs) and Boron Nitride Nanotubes (BNNTs) improves the hardness, wear resistance and toughness of the coatings; the whole cutter has good toughness, and also has very high hardness and wear resistance. In the cutting process, when the temperature is low, the graphene can play a role in lubrication, and PbO, Mo and TiB are used at high temperature2Can generate in-situ reaction to generate PbMoO with lubricating effect4、TiO2And B2O3Thereby reducing the frictional wear of the cutter in the cutting process and prolonging the service life of the cutter. The cutter can be widely applied to dry cutting and cutting processing of difficult-to-process materials.
Description
Technical Field
The invention belongs to the technical field of mechanical cutting tool manufacturing, and particularly relates to a plasma spraying gradient hard coating self-lubricating tool and a preparation method thereof.
Background
Dry cutting has become a research hotspot for green machining as a new economic and environment-friendly manufacturing technology. However, in dry cutting, the blade-chip friction on the rake surface is abnormally severe, and a large amount of heat is generated, resulting in increased wear and reduced life of the tool. Therefore, research and development of new tools are urgently needed. The self-lubricating cutter is characterized in that the cutter material has lubricating and antifriction functions, and self-lubricating cutting processing can be realized under the condition of no lubricating liquid, so that the surface friction and abrasion of the cutter are reduced.
The tool coating technology is a high-quality surface modification technology, the coated tool has the advantages of high hardness, good heat resistance, oxidation resistance, corrosion resistance and the like, and the coating treatment of the tool surface is one of important methods for prolonging the service life of the tool. In order to further improve the performance of the cutter, the coated cutter is developed from single layer to diversification and recombination; meanwhile, the single coating is limited in the using process, and the preparation of the gradient composite coating can not only give consideration to the excellent performance of the single coating, but also compensate the limitation, thereby obviously improving the performance of the coated cutter.
Chinese invention patent "application number: 2011102143939.2 discloses a gradient laminated coating cutter and its preparation method, the cutter combines the characteristics of ZrN, ZrTiN and gradient laminated structure, and has high hardness and wear resistance. Chinese invention patent "application number: 201810077086.6 reports a silicon nitride-hard alloy gradient coating cutter and a preparation method thereof, the gradient coating on the surface of the cutter combines the advantages of silicon nitride-based ceramics and hard alloy, and has both higher hardness and good toughness. Chinese invention patent "application number: 201310465488.0 discloses a method for preparing a laser cladding soft-hard composite coating self-lubricating cutter, which comprises cladding hard coatings such as silicon nitride ceramics or hard alloy on the front cutter surface of a cutter substrate, and cladding MoS2Or WS2The cutter has good toughness, high hardness and self-lubricating effect.
Disclosure of Invention
The purpose of the invention is as follows: the invention discloses a plasma spraying gradient hard coating self-lubricating cutter and a preparation method thereof, wherein the cutter has the advantages of high-speed steel, hard alloy, silicon nitride-based ceramic and cubic boron nitride, and has good toughness, high hardness and self-lubricating effect. The addition of the Carbon Nanotubes (CNTs) and the Boron Nitride Nanotubes (BNNTs) improves the hardness and the wear resistance of the cutter and simultaneously has good toughness; in the cutting process, when the temperature is low, the graphene can play a role in lubrication, and PbO, Mo and TiB are used at high temperature2Can generate in-situ reaction to generate PbMoO with lubricating effect4、TiO2And B2O3Thereby reducing the frictional wear of the tool during the cutting processThe service life of the cutter is prolonged.
The technical scheme is as follows: the invention relates to a plasma spraying gradient hard coating self-lubricating cutter which is realized by the following modes:
the tool base material is high-speed steel, the surface of the base body is provided with a gradient self-lubricating hard coating consisting of a hard alloy layer, a silicon nitride ceramic layer and a cubic boron nitride layer, and the hard coating is prepared by cladding a hard alloy mixed powder, a silicon nitride ceramic mixed powder and a cubic boron nitride mixed powder on the front tool face and the rear tool face of the tool base body in sequence by adopting a plasma spraying method; the hard alloy mixed powder comprises the following components in percentage by weight: 55-65% of WC, 5-8% of TiC, 5-8% of Co, 1-2% of TaN, 15-25% of Ni60A, 2-4% of PbO, 2-4% of Mo and 2-4% of TiB20.5-1.5% of BNNTs, 0.5-1.5% of CNTs and 0.5-1.5% of graphene, wherein the sum of the weight percentages of the materials is 100%; the silicon nitride ceramic mixed powder comprises the following components in percentage by weight: 40-60% Si3N4、10-20％ZrO2、15-25％Ni60A、2-5％PbO、2-5％Mo、2-5％TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%; the cubic boron nitride mixed powder comprises the following components in percentage by weight: 50-60% of CBN, 20-30% of Ni60A, 2-5% of PbO, 2-5% of Mo and 2-5% of TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%.
The invention relates to a plasma spraying gradient hard coating self-lubricating cutter, which comprises the following specific preparation steps:
(1) pretreatment: ultrasonic cleaning the cutter in alcohol and acetone solution for 20-30min respectively, and removing oil;
(2) cladding a hard alloy layer: preparing hard alloy mixed powder, wherein the hard alloy mixed powder comprises the following main components in percentage by weight: 55-65% of WC, 5-8% of TiC, 5-8% of Co, 1-2% of TaN, 15-25% of Ni60A, 2-4% of PbO, 2-4% of Mo and 2-4% of TiB20.5-1.5% of BNNTs, 0.5-1.5% of CNTs and 0.5-1.5% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared hard alloy mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to 10-80g/cm3(ii) a By means of a plasmaThe daughter spraying technology is used for cladding the hard alloy mixed powder on the front cutter surface and the rear cutter surface of the cutter, and the cladding process is carried out in a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 20-80kW, the Ar gas flow is 20-80L/min, and H2The air flow is 10-60L/min, and the scanning speed is 2-50 mm/s;
(3) cladding a silicon nitride ceramic layer: preparing silicon nitride ceramic mixed powder, wherein the silicon nitride ceramic mixed powder comprises the following main components in percentage by weight: 40-60% Si3N4、10-20％ZrO2、15-25％Ni60A、2-5％PbO、2-5％Mo、2-5％TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared silicon nitride ceramic mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to 10-80g/cm3(ii) a Cladding the silicon nitride ceramic mixed powder on the surface of the hard alloy layer by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 20-80kW, the Ar gas flow is 20-80L/min, and H2The air flow is 10-60L/min, and the scanning speed is 2-50 mm/s;
(4) cladding the cubic boron nitride layer: preparing cubic boron nitride mixed powder, wherein the cubic boron nitride mixed powder comprises the following main components in percentage by weight: 50-60% of CBN, 20-30% of Ni60A, 2-5% of PbO, 2-5% of Mo and 2-5% of TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared cubic boron nitride mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to 10-80g/cm3(ii) a Cladding the cubic boron nitride mixed powder on the surface of the silicon nitride ceramic layer by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 20-80kW, the Ar gas flow is 20-80L/min, and H2The air flow is 10-60L/min, and the scanning speed is 2-50 mm/s;
(5) and (3) post-treatment: and finishing the surface of the tool after cladding is finished to obtain the gradient hard coating self-lubricating tool, so that the total thickness of the coating is 100-3000 mu m.
Compared with the prior art, the invention has the beneficial effects that:
1. the cutter is made of high-speed steel,The addition of BNNTs and CNTs improves the hardness, wear resistance and toughness of the cutter; 2. in the cutting process, when the temperature is low, the graphene can play a role in lubrication, and PbO, Mo and TiB are used at high temperature2Can generate in-situ reaction to generate PbMoO with lubricating effect4、TiO2And B2O3The cutter has good self-lubricating effect at higher cutting temperature, so that the frictional wear of the cutter in the cutting process can be reduced, and the service life of the cutter is prolonged; 3. the coating is prepared by adopting a plasma spraying method, the preparation efficiency of the method is high, and the coating and the matrix have stronger bonding strength; meanwhile, the coating can reach a great thickness; 4. the cutter can be widely applied to dry cutting and cutting of difficult-to-machine materials, and has wide application prospect.
Drawings
Fig. 1 is a schematic structural diagram of the gradient hard coating self-lubricating cutter of the invention, wherein: 1 is a cutter base material, 2 is a hard alloy layer, 3 is a silicon nitride ceramic layer, and 4 is a cubic boron nitride layer.
Detailed Description
Example 1:
the tool base body is made of W9Mo3Cr4V high-speed steel, the surface of the base body is provided with a gradient self-lubricating hard coating consisting of a hard alloy layer, a silicon nitride ceramic layer and a cubic boron nitride layer, and the hard coating is prepared by cladding hard alloy mixed powder, silicon nitride ceramic mixed powder and cubic boron nitride mixed powder on the front tool face and the rear tool face of the tool base body in sequence by adopting a plasma spraying method; the hard alloy mixed powder comprises the following components in percentage by weight: 55% of WC, 8% of TiC, 8% of Co, 1% of TaN, 20% of Ni60A, 2% of PbO, 2% of Mo and 2% of TiB20.5 percent of BNNTs, 0.5 percent of CNTs and 1 percent of graphene, wherein the sum of the weight percentages of the materials is 100 percent; the silicon nitride ceramic mixed powder comprises the following components in percentage by weight: 45% Si3N4、20％ZrO2、20％Ni60A、4％PbO、4％Mo、2％TiB22% of BNNTs, 2% of CNTs and 1% of graphene, wherein the sum of the weight percentages of the materials is 100%; cubic boron nitride mixtureThe powder comprises the following components in percentage by weight: 55% CBN, 30% Ni60A, 4% PbO, 4% Mo, 2% TiB22 percent of BNNTs, 2 percent of CNTs and 1 percent of graphene, wherein the sum of the weight percent of the materials is 100 percent.
The invention relates to a plasma spraying gradient hard coating self-lubricating cutter, which comprises the following specific preparation steps:
(1) pretreatment: ultrasonic cleaning the cutter in alcohol and acetone solution for 20min respectively, and removing oil;
(2) cladding a hard alloy layer: preparing hard alloy mixed powder, wherein the hard alloy mixed powder comprises the following main components in percentage by weight: 55% of WC, 8% of TiC, 8% of Co, 1% of TaN, 20% of Ni60A, 2% of PbO, 2% of Mo and 2% of TiB20.5 percent of BNNTs, 0.5 percent of CNTs and 1 percent of graphene, wherein the sum of the weight percentages of the materials is 100 percent; the prepared hard alloy mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to be 60g/cm3(ii) a Adopting a plasma spraying technology to clad the hard alloy mixed powder on the front cutter surface and the rear cutter surface of the cutter, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: power 20kW, Ar gas flow 20L/min, H2The air flow is 20L/min, and the scanning speed is 2 mm/s;
(3) cladding a silicon nitride ceramic layer: preparing silicon nitride ceramic mixed powder, wherein the silicon nitride ceramic mixed powder comprises the following main components in percentage by weight: 45% Si3N4、20％ZrO2、20％Ni60A、4％PbO、4％Mo、2％TiB22% of BNNTs, 2% of CNTs and 1% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared silicon nitride ceramic mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to be 60g/cm3(ii) a Cladding the silicon nitride ceramic mixed powder on the surface of the hard alloy layer by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: power 20kW, Ar gas flow 20L/min, H2The air flow is 20L/min, and the scanning speed is 2 mm/s;
(4) cladding the cubic boron nitride layer: preparing cubic boron nitride mixed powder, wherein the cubic boron nitride mixed powder comprises the following main components in percentage by weight: 55% CBN, 30% Ni60A, 4% PbO, 4% Mo, 2% TiB22% of BNNTs, 2% of CNTs and 1% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared cubic boron nitride mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to be 60g/cm3(ii) a Cladding the cubic boron nitride mixed powder on the surface of the silicon nitride-based ceramic by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: power 20kW, Ar gas flow 20L/min, H2The air flow is 20L/min, and the scanning speed is 2 mm/s;
(5) and (3) post-treatment: and finishing the surface of the cutter after cladding is finished to obtain the gradient hard coating cutter, wherein the total thickness of the coating is 2500 mu m.
Example 2:
the tool base body is made of W9Mo3Cr4V high-speed steel, the surface of the base body is provided with a gradient self-lubricating hard coating consisting of a hard alloy layer, a silicon nitride ceramic layer and a cubic boron nitride layer, and the hard coating is prepared by cladding hard alloy mixed powder, silicon nitride ceramic mixed powder and cubic boron nitride mixed powder on the front tool face and the rear tool face of the tool base body in sequence by adopting a plasma spraying method; the hard alloy mixed powder comprises the following components in percentage by weight: 60% WC, 5% TiC, 5% Co, 2% TaN, 16% Ni60A, 3% PbO, 3% Mo, 3% TiB 21% of BNNTs, 1% of CNTs and 1% of graphene, wherein the sum of the weight percentages of the materials is 100%; the silicon nitride ceramic mixed powder comprises the following components in percentage by weight: 55% Si3N4、15％ZrO2、16％Ni60A、3％PbO、3％Mo、3％TiB22% of BNNTs, 2% of CNTs and 1% of graphene, wherein the sum of the weight percentages of the materials is 100%; the cubic boron nitride mixed powder comprises the following components in percentage by weight: 60% CBN, 25% Ni60A, 3% PbO, 3% Mo, 3% TiB22% of BNNTs, 2% of CNTs and 2% of graphene, wherein the sum of the weight percentages of the materials is 100%.
The invention relates to a plasma spraying gradient hard coating self-lubricating cutter, which comprises the following specific preparation steps:
(1) pretreatment: sequentially placing the cutter in alcohol and acetone solution, ultrasonic cleaning for 30min respectively, and removing oil contamination;
(2) cladding a hard alloy layer: preparing hard alloy mixed powder, wherein the hard alloy mixed powder comprises the following main components in percentage by weight: 60% WC, 5% TiC, 5% Co, 2% TaN, 16% Ni60A, 3% PbO, 3% Mo, 3% TiB 21% of BNNTs, 1% of CNTs and 1% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared hard alloy mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to be 20g/cm3(ii) a Adopting a plasma spraying technology to clad the hard alloy mixed powder on the front cutter surface and the rear cutter surface of the cutter, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 60kW, the Ar gas flow is 60L/min, and H is2The air flow is 60L/min, and the scanning speed is 50 mm/s;
(3) cladding a silicon nitride ceramic layer: preparing silicon nitride ceramic mixed powder, wherein the silicon nitride ceramic mixed powder comprises the following main components in percentage by weight: 55% Si3N4、15％ZrO2、16％Ni60A、3％PbO、3％Mo、3％TiB22% of BNNTs, 2% of CNTs and 1% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared silicon nitride ceramic mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to be 20g/cm3(ii) a Cladding the silicon nitride ceramic mixed powder on the surface of the hard alloy layer by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 60kW, the Ar gas flow is 60L/min, and H is2The air flow is 60L/min, and the scanning speed is 50 mm/s;
(4) cladding the cubic boron nitride layer: preparing cubic boron nitride mixed powder, wherein the cubic boron nitride mixed powder comprises the following main components in percentage by weight: 60% CBN, 25% Ni60A, 3% PbO, 3% Mo, 3% TiB22% of BNNTs, 2% of CNTs and 2% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared cubic boron nitride mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to be 20g/cm3(ii) a Cladding the cubic boron nitride mixed powder on the surface of the silicon nitride ceramic by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 60kW, the Ar gas flow is 60L/min, and H is2The air flow is 60L/min, and the scanning speed is 50 mm/s;
(5) and (3) post-treatment: and finishing the surface of the cutter after cladding is finished to obtain the gradient hard coating cutter, wherein the total thickness of the coating is 300 mu m.
Claims (2)
1. The utility model provides a plasma spraying gradient hard coat self-lubricating cutter which characterized in that: the cutter base material is high-speed steel, the surface of the base body is provided with a gradient self-lubricating hard coating consisting of a hard alloy layer, a silicon nitride ceramic layer and a cubic boron nitride layer, and the hard coating is prepared by adopting a plasma spraying method; the preparation method adopts a plasma spraying technology to sequentially clad hard alloy mixed powder, silicon nitride ceramic mixed powder and cubic boron nitride mixed powder on the front cutter face and the rear cutter face of the cutter matrix to prepare the gradient self-lubricating hard coating; the hard alloy mixed powder comprises the following components in percentage by weight: 55-65% of WC, 5-8% of TiC, 5-8% of Co, 1-2% of TaN, 15-25% of Ni60A, 2-4% of PbO, 2-4% of Mo and 2-4% of TiB20.5-1.5% of BNNTs, 0.5-1.5% of CNTs and 0.5-1.5% of graphene, wherein the sum of the weight percentages of the materials is 100%; the silicon nitride ceramic mixed powder comprises the following components in percentage by weight: 40-60% Si3N4、10-20％ZrO2、15-25％Ni60A、2-5％PbO、2-5％Mo、2-5％TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%; the cubic boron nitride mixed powder comprises the following components in percentage by weight: 50-60% of CBN, 20-30% of Ni60A, 2-5% of PbO, 2-5% of Mo and 2-5% of TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%.
2. The plasma spraying gradient hard coating self-lubricating cutter according to claim 1 is characterized by comprising the following specific preparation steps:
(1) pretreatment: ultrasonic cleaning the cutter in alcohol and acetone solution for 20-30min respectively, and removing oil;
(2) cladding a hard alloy layer: preparing hard alloy mixed powder, wherein the hard alloy mixed powder comprises the following main components in percentage by weight: 55-65% of WC, 5-8% of TiC, 5-8% of Co, 1-2% of TaN, 15-25% of Ni60A and 2-4% of PbO、2-4％Mo、2-4％TiB20.5-1.5% of BNNTs, 0.5-1.5% of CNTs and 0.5-1.5% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared hard alloy mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to 10-80g/cm3(ii) a Adopting a plasma spraying technology to clad the hard alloy mixed powder on the front cutter surface and the rear cutter surface of the cutter, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 20-80kW, the Ar gas flow is 20-80L/min, and H2The air flow is 10-60L/min, and the scanning speed is 2-50 mm/s;
(3) cladding a silicon nitride ceramic layer: preparing silicon nitride ceramic mixed powder, wherein the silicon nitride ceramic mixed powder comprises the following main components in percentage by weight: 40-60% Si3N4、10-20％ZrO2、15-25％Ni60A、2-5％PbO、2-5％Mo、2-5％TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared silicon nitride ceramic mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to 10-80g/cm3(ii) a Cladding the silicon nitride ceramic mixed powder on the surface of the hard alloy layer by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 20-80kW, the Ar gas flow is 20-80L/min, and H2The air flow is 10-60L/min, and the scanning speed is 2-50 mm/s;
(4) cladding the cubic boron nitride layer: preparing cubic boron nitride mixed powder, wherein the cubic boron nitride mixed powder comprises the following main components in percentage by weight: 50-60% of CBN, 20-30% of Ni60A, 2-5% of PbO, 2-5% of Mo and 2-5% of TiB20.5-2% of BNNTs, 0.5-2% of CNTs and 0.5-2% of graphene, wherein the sum of the weight percentages of the materials is 100%; the prepared cubic boron nitride mixed powder is filled into a powder feeder, and the powder feeding speed of the powder feeder is adjusted to 10-80g/cm3(ii) a Cladding the cubic boron nitride mixed powder on the surface of the silicon nitride ceramic layer by adopting a plasma spraying technology, wherein the cladding process is carried out by adopting a synchronous powder feeding mode; plasma processing parameters were as follows: the power is 20-80kW, the Ar gas flow is 20-80L/min, and H2The air flow is 10-60L/min, and the scanning speed is 2-50 mm/s;
(5) and (3) post-treatment: and finishing the surface of the tool after cladding is finished to obtain the gradient hard coating self-lubricating tool, so that the total thickness of the coating is 100-3000 mu m.
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| JPS59174558A (en) * | 1983-03-24 | 1984-10-03 | タテホ化学工業株式会社 | Ceramic crosslinked formed body and manufacture |
| US7842403B2 (en) * | 2006-02-23 | 2010-11-30 | Atotech Deutschland Gmbh | Antifriction coatings, methods of producing such coatings and articles including such coatings |
| CN105603387B (en) * | 2016-02-11 | 2018-04-03 | 广东工业大学 | Boron nitride system composite coating, the gradient ultra-fine cemented carbide cutter with the composite coating and preparation method thereof |
| CN108300993A (en) * | 2018-01-26 | 2018-07-20 | 东南大学 | Silicon nitride-hard alloy gradient coating cutter and preparation method thereof |
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